package com.bw.controller;

import com.alibaba.fastjson.JSON;
import com.bw.entity.User;
import com.bw.mapper.UserMapper;
import org.spring.kun.common.Md5Utils;
import org.spring.kun.common.TokenUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;
import java.util.concurrent.TimeUnit;

@Controller
public class LoginController {


    @Autowired
    UserMapper userMapper;

    @Autowired
    RedisTemplate redisTemplate;

    @RequestMapping("/loginPage.do")
    public String loginPage(){

        return "login";
    }


    @RequestMapping("/login.do")
    public String login(@Valid User loginUser, BindingResult result , Model model, HttpServletResponse response){
            if (result.hasErrors()){

                model.addAttribute("error",result.getAllErrors().get(0).getDefaultMessage());

                return "login";
            }

        // 判断用户名是否存在
        User userDB =   userMapper.selectByName(loginUser.getName());
        if (userDB == null){
            model.addAttribute("error","用户名不存在");
            return "login";
        }
        String password = userDB.getPassword();
        String salt = userDB.getSalt();
        String loginUserPassword = loginUser.getPassword();
        String md5String = Md5Utils.getMD5String(loginUserPassword + salt);

        if (!md5String.equals(password)){
            model.addAttribute("error","密码错误");
            return "login";  // 给浏览器返回一个login.jsp

        }

        // 根据用户信息 加密得到token（JWTUtil）, 把token放入cookie，  把cookie返回给浏览器, token 有效期30min
        TokenUtils.responseTokenByCookie(userDB,response,30);
        //使用Redis存储用户信息， 设置过期时间为30min
        redisTemplate.opsForValue().set(userDB.getName(), JSON.toJSONString(userDB),30, TimeUnit.MINUTES);
        return "redirect:list.do"; // 重定向，  返回给浏览器一个命令: 让浏览器去访问list.do
    }
}
